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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7120e06f1e6fd99d047c0ad04ff2d789f7038d2cf1a36eb473b3b4aa1c17d021' 
  AND token = 'zr0Owj7telxmCqla1BDjlQIs1cggREAdwPaYASV4u+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}